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The E010 is one of the most well protected mini quadcopters. The ducted fan wraps completely around each blade creating a protective cage that is very solid. The blades have 4 propellers instead of the typical 2, which means they don’t have to spin as fast making it quieter and less dangerous.
The battery is a 150mAh lipo which is going to give you around 5 minutes of flight time. Charging is done on the included USB charger. The battery is replaceable and extra batteries are very affordable.
The Eachine E010 is a very stable quadcopter with some awesome blade protection. Putting the blades inside a tube increases their performance, makes them quieter and does a better job at protecting them than blade guards. This not only saves you from getting cut from the blades, but also increases the life of the quadcopter.